/Engine/Source/Editor/UnrealEd/Public/Kismet2/KismetReinstanceUtilities.h
Replace all instances of OldClass with a new instance of NewClass
static void ReplaceInstancesOfClass ( [UClass](API\Runtime\CoreUObject\UObject\UClass) * OldClass, [UClass](API\Runtime\CoreUObject\UObject\UClass) * NewClass, const [FReplaceInstancesOfClassParameters](API\Editor\UnrealEd\Kismet2\FReplaceInstancesOfClassParamete-) & Params )